Big Valve Dual Port Head, 85.5mm with Single Springs, Complete

Bare Head comes with 40mm Intake and 35.5mm Exhaust Seats and Bronze Valve Guides Installed. Rocker, Exhaust and Intake Studs are included. Available with 12mm 3/4" reach plug. Stock size ports. This part is no longer available for purchase. This part has been superseded by 98-1380-B.